Bump ctest from 0.2.6 to 0.2.7
Bumps [ctest](https://github.com/alexcrichton/ctest) from 0.2.6 to 0.2.7.
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This commit prepares the `libc` crate to be included directly into the
standard library via crates.io. More details about this can be found on
rust-lang/rust#56092, but the main idea is that this crate now depends
on core/compiler-builtins explicitly (but off-by-default).
The main caveat here is that this activates `no_core` when building as
part of libstd, which means that it needs to explicitly have an `iter`
and `option` module for the expansion of `for` loops to work.
Linux 4.18 added support for SIGSYS info in signalfd. Add the new
fields to signalfd_siginfo.
While the kernel has support for these new fields now, no libc has
shipped a release with the new signalfd fields.
Theoretically test statics
There are none of them in `libc` except for `__progname` on Android, but
that one cannot be tested because it's not present in any header files.
